PHOTO SENSING UNIT AND PHOTO SENSOR THEREOF
First Claim
1. A photo sensing unit, comprising:
- a photo sensing transistor, having a first gate, a first source, and a first drain, used to receive a light signal for inducing a photo current correspondingly, wherein the first source is coupled to a first signal source, and the first gate is coupled to a second signal source;
a storage capacitor, having a first end and a second terminal, used to store a plurality of electrical charges induced from the light signal, wherein the first end is coupled to the first drain, and the second end is coupled to a low voltage; and
a switching transistor, having a second gate, a second source, and a second drain, controlled by the second signal source, and used to output a readout signal stored in the storage capacitor to signal readout line, wherein the second source is coupled to the first end, and the second drain is coupled to the signal readout line, and the second gate is coupled to the second signal source;
wherein a threshold voltage of the photo sensing transistor is higher than that of the switching transistor.
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Abstract
A photo sensing unit used in a photo sensor includes a photo sensing transistor, a storage capacitor, and a switching transistor. The photo sensing transistor receives a light signal for inducing a photo current correspondingly, and a source and a gate thereof are respectively coupled to the first signal source and the second signal source. The storage capacitor stores electrical charges induced by the light signal, one terminal thereof is coupled to drain of the photo sensing transistor, and another terminal thereof is coupled to a low voltage. The switching transistor is controlled by the second signal source for outputting a readout signal from the storage capacitor to the signal readout line. The threshold voltage of the photo transistor is higher than that of the switching transistor.
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Citations
20 Claims
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1. A photo sensing unit, comprising:
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a photo sensing transistor, having a first gate, a first source, and a first drain, used to receive a light signal for inducing a photo current correspondingly, wherein the first source is coupled to a first signal source, and the first gate is coupled to a second signal source; a storage capacitor, having a first end and a second terminal, used to store a plurality of electrical charges induced from the light signal, wherein the first end is coupled to the first drain, and the second end is coupled to a low voltage; and a switching transistor, having a second gate, a second source, and a second drain, controlled by the second signal source, and used to output a readout signal stored in the storage capacitor to signal readout line, wherein the second source is coupled to the first end, and the second drain is coupled to the signal readout line, and the second gate is coupled to the second signal source; wherein a threshold voltage of the photo sensing transistor is higher than that of the switching transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A photo sensor, comprising:
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a plurality of photo sensing units; a first signal source circuit, used to provide first signal sources to the photo sensing units; a second signal source circuit, used to provide second signal sources to the photo sensing units; and an outputting circuit, used to receive readout signals outputted from the photo sensing units, and to output the readout signals sequentially; wherein each of the photo sensing units comprises; a photo sensing transistor, having a first gate, a first source, and a first drain, used to receive a light signal for inducing a photo current correspondingly, wherein the first source is coupled to the first signal source, and the first gate is coupled to the second signal source; a storage capacitor, having a first end and a second terminal, used to store a plurality of electrical charges induced from the light signal, wherein the first end is coupled to the first drain, and the second end is coupled to a low voltage; and a switching transistor, having a second gate, a second source, and a second drain, controlled by the second signal source, and used to output the readout signal stored in the storage capacitor to signal readout line, wherein the second source is coupled to the first end, and the second drain is coupled to the signal readout line, and the second gate is coupled to the second signal source; wherein a threshold voltage of the photo sensing transistor is higher than that of the switching transistor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification